Abrading tool



July 12, 1966 R. c COLLINS ABRADING TOOL Filed March 1, 1965 UnitedStates Patent 3,260,254 ABRADING TOOL Robert C. Collins, 746 NE. 67thSt., Miami, Fla.

Filed Mar. 1, 1965, Ser. No. 436,120 3 Claims. (Cl. 125-5) A furtherobject of the invention is a helical spring which serves the dualpurpose of an outer safety guard and for simultaneously holding the fiveshafts slidably retained in a toroidal collar of the tool.

A further object of the invention comprehends the provision of arectangular slot in the outer end of each shaft for retaining anedgewise wound helical spring therein.

These and other objects and advantages in one embodiment of theinvention are shown and described in the appended specification anddrawing, in which:

FIG. 1 is a side elevation of the abrading tool.

FIG. 2 is a bottom plan view of the tool shown in FIG. 1.

FIG. 3 is a cross sectional side elevation taken through section line3-3, FIG. 2.

FIG. 4 is a perspective view of the retaining spring shown in FIGS. 1,2, and 3.

Referring to FIGS. 1, 2, and 3, a shank member 1 is intended to besecured in and rotated by a conventional chuck 2 of a power drill orequivalent device. The shank 1 has a coaxial enlarged lower end 3 intowhich the upper end of a conical drive spring 4 is securely threaded.The lower end of spring 4 is threaded into the threaded coaxial bore ofthe toroidal collar 5, better shown in FIGS. 2 and 3.

Five shafts 6 are slidably retained in equi-spaced radial bores incollar 5, as shown. Each shaft 6 has journalled thereon three toothedabrading discs 7 which are spaced by washer-like spacers 8.

The outer end of each shaft 6 is provided with a transverse rectangulargroove 9 for retaining a pre-tensioned edgewise wound spring guard 10,which comprises three turns of tempered metal, as shown.

In operation and when the spring 10 is in its relaxed position, theinside diameter is a predetermined dimension smaller than the circledescribed by the inner side of the rectangular grooves 9.

When the shafts 6 are slidably positioned in collar and the abradingdiscs 7 and the washers 8 are positioned for rotation on the shafts 6then the spring is forcibly enlarged to engage all five slots 9, whichwill result in urging each axle into its innermost proper position withconsiderable force.

It is also apparent that when the discs 7 or shaft 6 require replacementthe ring may likewise be expanded for removal.

It is now also apparent that a multi-tum spring formed from round wireor wire of each of several shapes will 3,260,254 Patented July 12, 1966serve equally well as the edgewise wound spring previously described.

The results of the tool are substantially the same as described inapplicants aforesaid application except for the smooth non-damagingnature of spring 10 as a guard and the ease with which worn parts may bereplaced.

It is understood that certain modifications in the construction,utilizing the features above described, are intended to come within thescope of the appended claims.

Having described my invention, I claim:

1. A rotary abrading tool comprising a body member having a bore thereinfor retaining a coupling means,

a helical spring coupling secured by one end portion thereof in saidbore coaxial therewith and the opposite end thereof terminating in astraight shank substantially coaxial with said bore,

a plurality of shafts retained in and projecting from said body memberwith the axes thereof in equispaced radial relation to the said axis ofsaid bore and in a plane normal thereto,

each of said shafts having a transverse slot in the outer end thereof,

a circular multi-turn spring means retained in each of said slots forretaining each of said shafts in each corresponding said bore saidspring means comprising .a pre-tensioned edgewise spring guard having apre-determined dimension smaller than a circle described by the innersides of said slots,

a like plurality of like abrading discs journalled for rotation on eachof said shafts whereby the latter will rotate and abrade a substantiallyplanar surface in contact therewith when said shank is rotated.

2. A rotary abrading tool comprising a body member having a bore thereinfor retaining a coupling means,

a helical spring coupling secured by one end portion thereof in saidbore coaxial therewith and the opposite end thereof terminating in astraight shank substantially coaxial with said bore,

a plurality of shafts retained in .and projecting from said body withthe axes thereof in equi-spaced radial relation to the said axis of saidbore and in a plane normal thereto,

each of said shafts having a transverse slot in the outer end thereof,

a circular multi-turn pretensioned spring means retained in each of saidslots for retaining each of said shafts in each corresponding said bore,

said spring means comprising a predetermined number of close edgewisewound metal ribbon having a substantially rectangular cross sectionwhereby said spring means has a pre-determined dimension smaller than acircle described by the inner sides of said slots,

a like plurality of like abrading discs journalled for rotation on eachof said shafts whereby the latter will rotate and abrade a substantiallyplanar surface in contact therewith when said shank is rotated.

3. In an abrading tool of the character described a generallycylindrical body member adapted to be rotated about the axis thereof,

said body member having a plurality of like equi-spaced radial bores inthe outer periphery thereof,

a plurality of like shafts slidably retained in each of said bores byone end portion thereof abrading discs journalled for rotation on saidshafts,

References Cited by the Examiner UNITED STATES PATENTS 2,450,425 10/1948Frisby 85-88 5 3,080,771 3/1963 Baldwin 8.5-8.8

FOREIGN PATENTS 10,042 4/1913 Great Britain.

10 HAROLD D. WHITEHEAD, Primary Examiner.

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1. A ROTARY ABRADING TOOL COMPRISING A BODY MEMBER HAVING A BORE THEREINFOR RETAINING A COUPLING MEANS, A HELICAL SPRING COUPLING SECURED BY ONEEND PORTION THEREOF IN SAID BORE COAXIAL THEREWITH AND THE OPPOSITE ENDTHEREOF TERMINATING IN A STRAIGHT SHANK SUBSTANTIALLY COAXIAL WITH SAIDBORE, A PLURALITY OF SHAFTS RETAINED IN AND PROJECTING FROM SAID BODYMEMBER WITH THE AXES THEREOF IN EQUISPACED RADIAL RELATION TO THE SAIDAXIS OF SAID BORE AND IN A PLANE NORMAL THERETO, EACH OF SAID SHAFTSHAVING A TRANSVERSE SLOT IN THE OUTER END THEREOF, A CIRCULAR MULTI-TURNSPRING MEANS RETAINED IN EACH OF SAID SLOTS FOR RETAINING EACH OF SAIDSHAFT IN EACH